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Signature Series 4 Row Bleacher Steel Understructure

$474.00$874.00

The Signature Series Steel Bleacher 4 Row Understructures offer unbeatable value and performance.

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Granite Industries Signature Series 4 Row Steel Bleacher Understructure

The Signature Series Steel Bleacher Understructures offer unbeatable value and performance. Engineered, manufactured and assembled in the USA, the Signature steel supports are built to last. This particular understructure is made for 4 rows of bleachers. Granite steel supports are made from A500 steel. This steel is known for it’s strength characteristics.

The black powdercoat finish offers unmatched finish and expected life. These steel frames offer plenty of versatility as you can add your own seatboard or footboard. Also included are galvanized steel X-braces. These braces are built for ease of use and rigidity.

There are 3 different 4 row options:

  • 4 Row, 6′ Long (90309) – This option includes two (2) steel frames and two (2) X-braces. These frames are designed to be placed 6′ apart. The recommended seatboard length is 9′ for this option. Seats 24 people when properly equipped. Package weighs 94 lbs.
  • 4 Row, 12′ Long (90310) – This option includes three (3) steel frames and four (4) X-braces. These frames are designed to be placed 6′ apart. The recommended seatboard length is 15′ for this option. Seats 40 people when properly equipped. Package weighs 118 lbs.
  • 4 Row, 18′ Long (90311) – This option includes four (4) steel frames and six (6) X-braces. These frames are designed to be placed 6′ apart. The recommended seatboard length is 21′ for this option. Seats 56 people when properly equipped. Package weights 206 lbs.

All-In-One Starter Package Includes

  • Black Powder Coated Steel Frames (Ranging from 2-4 based on package ordered)
  • Galvanized Steel X-braces (Ranging from 2-6 based on package ordered)
  • Hardware Kit
  • Backed by an industry leading five year warranty.


Looking for a quantity discount or more options?


  • Approximate Support Dimensions: 3″ W x 6’7″ D x 2’6″ H
  • Additional OSHA requirements: None – with height below 30″
  • 5 year limited warranty
  • View the full specification sheet: Signature Series 4 Row Steel Bleacher

Download the Staging,Seating & Fencing Catalog: Staging, Seating, & Fencing Catalog

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Freight Shipping

  • If the order quantity allows for freight shipping, we will ship it via freight.
  • Optional lift gate service lowers the freight to ground level for easy unloading in residential areas
  • For more information, please review our freight policy: Granite’s Freight Shipping Policy

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